The Two-Step Spring Brew: From Straw Tea to Alfalfa Power
, by Glenn Wilson, 3 min reading time
As hosta enthusiasts, we spend all winter dreaming of that first glimpse of pips breaking through the mulch. But once they arrive, the temptation is to hit them with everything we've got to wake them up. In my years of managing hundreds of varieties at the nursery, I've found that a staged approach — starting gently and building up the power — is the secret to healthy, resilient plants that not only grow fast but also grow strong.
Here is why (and how) I transition from a mild straw soak to the legendary Alfalfa Barrel as the season unfolds.
Phase 1: The Early Season Straw Tea
When the first pips — like the ever-eager Hosta 'Garden Party' — begin to show, their root systems are just beginning to activate. Pushing them with heavy nitrogen too early can lead to soft growth that is easily damaged by a late-season frost.
Why Start with Straw?
- Gentle Soil Conditioning: Straw water is rich in humic acids and beneficial microbes that prime the soil without forcing leaf growth.
- Resourceful Recycling: If you use straw to mulch your pots over winter, this is the perfect way to get one last use out of it before it hits the compost pile.
- Safe Hydration: It's a mild vitamin water that strengthens the crown as it expands, without the risk of nutrient burn.
The Method:
- The Ratio: Loosely fill a 30-gallon garbage can about one-third full of clean straw.
- The Steep: Fill with water and let it sit for 24 to 48 hours (no longer than 48 hours).
- The Application: Strain out the debris and use it as a soil drench directly over the emerging pips.
Phase 2: The Alfalfa Protein Shake
Once the hostas have fully unfurled their leaves and the threat of frost has passed, it's time to bring out the big guns. This is when the plant is ready to process more fuel.
Why Move to Alfalfa?
- Triacontanol: This is the magic ingredient. Alfalfa contains this natural growth stimulant that increases root mass and encourages more eyes (buds) to develop for next year.
- The Magnesium Boost: By adding 1 cup of Epsom salts to your 30-gallon brew, you provide the magnesium necessary for deep, waxy lustre and vibrant leaf colour.
The Method:
- The Ratio: Use 4 to 5 cups of alfalfa pellets (or 6–8 cubes) and 1 cup of Epsom salts for a 30-gallon barrel.
- The Steep: Let it brew for 3 days, stirring vigorously once a day to aerate.
- The Application: Pour 1–2 litres at the base of each established hosta every 2–3 weeks during June and July.
Critical Tips for a Successful Brew
1. Manage the Aroma
Let's be honest: after three days in the sun, alfalfa tea has a very potent, fermented odour. Keep the lid tightly secured on your barrels while brewing to contain the scent. Always water in the early morning — the smell usually dissipates once the tea soaks into the soil.
2. The Tea Bag Trick
To prevent your watering can from clogging, put your straw or alfalfa pellets into a mesh laundry bag or burlap sack before dropping them into the water. This keeps the sludge contained and makes cleanup a breeze.
3. The Bunny Magnet Warning
Rabbits love alfalfa as much as hostas do. If you have a high rabbit population, avoid leaving thick sludge on top of the soil. Use the mesh bag method above, or bury any leftover muck a few inches deep so the roots can reach it but the rabbits can't smell it.
4. Don't Waste the Solids
When the barrel is empty, any remaining organic matter is gold for your compost pile or a particular slow-growing variety.
The Verdict
By starting with Straw Tea, you prepare the soil and protect tender pips. By finishing with Alfalfa, you ensure a lush, vigorous canopy. It's a two-step programme that respects the natural rhythm of the hosta's growth cycle.
Happy brewing, and may your pips be plenty!